Diffraction of Electrons in the CubicTi(5)O(5) Superstructure of Titanium Monoxide

Abstract

Annealed titanium monoxide TiO 1. 087 has been studied by the electron diffraction method. A cubic model of the Ti 5O 5 superstructure (Ti 5O 5 (Ti 90■ 18O 90□ 18)) of nonstoichiometric titanium monoxide Ti xO z has been proposed on the basis of experimental data and representations about the disorder-order transition channel. It has been shown that reflections observed on the electron diffraction pattern are identified in the space group Pm3̄m. The period of the unit cell of the cubic Ti 5O 5 superstructure is larger than that for the B1 basic disordered structure of Ti xO z monoxide by a factor of 3. The disorder-order transition channel Ti xO z (space group Fm3̄m)-Ti 5O 5 (space group Pm3̄m) includes 75 superstructure vectors of seven stars {k 10}, {k 7}, {k 6(1)}, {k 6(2)}, {k 4(1)}, {k 4(2)}, and {k 1}. The distribution functions of Ti and O atoms over the sites of the cubic Ti 5O 5 (space group Pm3̄m) superstructure have been calculated. © 2012 Pleiades Publishing, Ltd.